void disableAllIRQ( void )
{
outByte( (word)0x21u, 0xFFu );
ioWait();
outByte( (word)0xA1u, 0xFFu );
ioWait();
}
void enableAllIRQ( void )
{
outByte( (word)0x21u, 0 );
ioWait();
outByte( (word)0xA1u, 0 );
ioWait();
}
void sendEOI( void )
{
outByte( (word)0x20u, (byte)0x20u );
ioWait();
outByte( (word)0xA0u, (byte)0x20u );
ioWait();
}
void X86AtaDevice::identify() const
{
// Set features register. 0 = PIO, 1 = DMA.
outb(_ioPort + 1, 0);
outb(_controlPort, 0);
// select device
outb(_ioPort + kAtaRegisterDriveSelect, 0xA0 | _slaveBit << 4);
ioWait();
switch (type()) {
case Type::PATAPI:
case Type::SATAPI:
// send IDENTIFY PACKET DEVICE
outb(_ioPort + 0x07, 0xA1); break;
case Type::PATA:
case Type::SATA:
// send IDENTIFY DEVICE
outb(_ioPort + 0x07, 0xEC); break;
case Type::Unknown:
return;
}
ioWait();
// read in status
waitUntilReady(false);
// read in device information
uint16_t identity[256];
pioRead(identity, 256);
_descriptor.readIdentity(identity);
_identified = true;
if (type() == Type::PATAPI) {
uint16_t data[4];
performPioAtapiOperation(AtapiCommand::readCapacityCommand(), data, sizeof(data));
_descriptor.readAtapiCapacity(data);
}
}
void disableIRQ( unsigned int irq )
{
byte data;
if( irq > 15 )
return;
if( irq < 8 )
{
data = inByte( (word)0x21 );
ioWait();
outByte( (word)0x21, data | (byte)(1u << irq));
ioWait();
}
else
{
data = inByte( (word)0xA1 );
ioWait();
outByte( (word)0xA1, data | (byte)(1u << (irq-8)));
ioWait();
}
}
void enableIRQ( unsigned int irq )
{
byte data;
if( irq > 15 )
return;
if( irq < 8 )
{
data = inByte( (word)0x21u );
ioWait();
outByte( (word)0x21u, data & (byte)~(1u << irq));
ioWait();
}
else
{
data = inByte( (word)0xA1u );
ioWait();
outByte( (word)0xA1u, data & (byte)~(1u << (irq-8)));
ioWait();
}
}
X86AtaDevice::Type X86AtaDevice::type() const
{
softReset(); /* waits until master drive is ready again */
outb(_ioPort + kAtaRegisterDriveSelect, 0xA0 | _slaveBit<<4);
ioWait(); /* wait 400ns for drive select to work */
uint8_t cl = inb(_ioPort + kAtaRegisterCylinderLow); /* get the "signature bytes" */
uint8_t ch = inb(_ioPort + kAtaRegisterCylinderHigh);
/* differentiate ATA, ATAPI, SATA and SATAPI */
if (cl==0x14 && ch==0xEB) return Type::PATAPI;
if (cl==0x69 && ch==0x96) return Type::SATAPI;
if (cl==0 && ch == 0) return Type::PATA;
if (cl==0x3c && ch==0xc3) return Type::SATA;
return Type::Unknown;
}
uint8_t X86AtaDevice::waitUntilReady(bool errorCheck) const
{
uint8_t status = 0;
ioWait();
status = waitForStatus(-1);
if (errorCheck) {
status = inb(_ioPort + kAtaRegisterStatus);
if (status & kAtaStatusBitError) return 1;
if (status & kAtaStatusBitDriveFault) return 1;
if (!(status & kAtaStatusBitDRQ)) return 1;
}
return 0;
}
bool X86AtaDevice::readInternal(uint64_t address, uint16_t *buf, size_t sectors)
{
const size_t maxByteCount = sectorSize() * sectors;
outb(_ioPort + kAtaRegisterDriveSelect, 0xA0 | _slaveBit << 4);
ioWait();
switch (type()) {
case Type::PATAPI:
case Type::SATAPI:
// send READ(12)
return performPioAtapiOperation(AtapiCommand::read12Command(address, sectors), buf, maxByteCount);
case Type::PATA:
case Type::SATA:
// should send something, but for now...
kernel->panic("Attempted to read from unsupported ATA device.");
return false;
default:
return false;
}
}
void X86AtaDevice::softReset() const
{
outb(_controlPort, 0x04);
ioWait();
outb(_controlPort, 0x00);
}